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Low Speed Studies of Sweep and Dihedral Effects on Compressor Cascades

[+] Author Affiliations
Bhaskar Roy, P. A. Laxmiprasanna, Vishal Borikar, Amit Batra

Indian Institute of Technology – Bombay, Mumbai, India

Paper No. GT2002-30441, pp. 769-781; 13 pages
doi:10.1115/GT2002-30441
From:
  • ASME Turbo Expo 2002: Power for Land, Sea, and Air
  • Volume 5: Turbo Expo 2002, Parts A and B
  • Amsterdam, The Netherlands, June 3–6, 2002
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-3610-X | eISBN: 0-7918-3601-0
  • Copyright © 2002 by ASME

abstract

The use of three dimensional blade designs incorporating end bend, sweep and dihedral to reduce secondary flow related losses, improve efficiency and stable operating range has gained ground in the recent years. In the present study a straight cascade, a swept cascade, and a dihedral cascade have been considered. Effects of sweep and dihedral along the span are studied at 0° and +20° stagger. The study shows that both the sweep and the dihedral have lower end-wall losses compared to the straight cascade. However, lower losses are accompanied with lower diffusion factors. At mid-span also the lowering of losses is achieved along with some lowering of diffusion factor. While the dihedral seems to contribute for stable operation more near the end-wall, the swept blade contributes more near the mid-span. The swept blade is able to sustain the flow at higher angles of attack. While the end-wall loss benefits are welcome with lower loading, at mid-span lower loading obtained may need to be corrected by increasing the design angle of incidence.

Copyright © 2002 by ASME

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